Origin of overnight

Middle English word dating back to 1325–75; see origin at over-, night
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for overnight

British Dictionary definitions for overnight

overnight

adverb (ˌəʊvəˈnaɪt)

for the duration of the nightwe stopped overnight
in or as if in the course of one night; suddenlythe situation changed overnight

adjective (ˈəʊvəˌnaɪt) (usually prenominal)

verb (intr)

to stay the night
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012